Originally Posted by jayray
Isn't this statement a bit odd in that, if one is doing themselves, as opposed to the people who do it professionally in R&D they are in fact self professed pros and not full time, with the background and many years of experience of those at Paradigm's facility or any other speaker co. I don't love corporations but many do great work and produce excellent products and they all don't lie about specs.
Commercial companies frequently make engineering trade offs that are non optimal from a performance standpoint, instead geared towards WAF or marketing. For example, Hoffman's Law dictates that putting many speakers in one small enclosure will reduce efficiency at low frequency. This is likely why the power requirements on the amp are so high. Somewhere on the other extreme would be a design like the Terraform XL, which has measured flat +/-3dB down to ~11z with "only" a 1200W amplifier.
That said, I would be interested to see the Sub1/Sub2 un-EQ'ed frequency response, distortion, and power requirements in an anechoic environment (outdoors).
Originally Posted by netroamer
As for using the PBK, I was told, months ago, by Piero at Anthem that ARC will do the same job and there was no need to run PBK first. I'll ask again.
PBK is really just ARC specifically for the subwoofer, so if you only have one subwoofer, that is a very reasonable statement. For multiple subs, you may want to run PBK first on each sub to independently deal with each sub's modal room excitations, which can differ dramatically. In general, however, I would not recommend running layers of EQ on top of each other, especially when said EQ commits the cardinal sin of overdriving the nulls. (PBK raises nulls, and I assume ARC does as well.) The best solution is to acoustically damped the room, and place the subs properly.
Disclaimer: I have the Sub 12 and found the PBK useful, but too idiot-proof for my liking. I would rather have direct control of the subwoofer's EQ, but unfortunately you have to use PBK's automated results if you want sub EQ. I get better results determining my room response with my own Matlab scripts, since I'm not restricted to 1/3 octave smoothing, and can get 1Hz (or better) resolution. I have some bass traps coming in from GIK, and I may trade in my Sub12 for dual Sub15's, at which point I may forgo EQ altogether.